Double-oven cooking-stove



J. Mc GREGOR. Jr. Cooking Stove.

Pate nted=March"l9, 1850.

n LIERS. Plwtn-mhomphn. Wuhin mn. 0.6.

. UNITED STATES PATENT OFFICE.

JAMESMACGREGOR, JR., OF WILTON, NEW YORK.

DOUBLE-OVEN COOKING-STOVE. a

Specification of Letters Iatent No. 7,193, dated March 19, 1850.

To all whom; it may concern:

Be it known that I, JAMES MAoGREeoR, Jr., of Wilton, in the county ofSaratoga and State of New York, have invented new and usefulImprovements in Cooking- Stoves, and that the following is a full,clear, and exact description of the principle or character whichdistinguishes them from all other things before known and of the mannerof making, constructing, and using the same, reference being had to theaccompanying drawings, making part of this specification, in whichFigure 1 is an isometrical projection of the stove with one sideremoved; Fig. 2, is a vertical longitudinal section 'through the firechamber and flues; Fig. 3, is a section through the division plate (a)that goes between the front boilers; Fig. 4, the center oven fluedetached.

The same letters indicate like parts in all thefigures.

The nature of my improvements consists in protecting the division plate(a) between the front boilers by forming an 'oblong opening therein andpermitting a current of cold air to pass through it and in dividing theoven of the stove when desired into two parts by introducing a movablehorizontal flue through which when in place a portion of the smoke andheat passes, there being openings in the front and back plates of theoven for that purpose.

vThe construction is as follows: The exterior is of nearly cubicalshape, with four boiler holes (more or less) on the top. The divisionplate (a) between the front boilers being subjected to the most intenseheat from the fire over which it is situated is liable to be warped andinjured thereby, to prevent which I form an oblong opening through itscenter very narrow and surrounded by a flanch (b) to stiffen the plate.From the fire chamber the heat passes back in a horizontal flue ofproper proportion over the oven thence it descends behind the oven intothe lower flue (0) which flue is made of great capacity, being the wholeWidth of the oven and of double the depth (more or less) of that above;thence the draft passes into an upright flue (a?) on one side of thefire chamber and out through the pipe. On each side of the oven (6)there is an opening (f) nearly the whole width of the stove; immediatelybelow these openings are brackets (k) on which a movable flue ('5)slides into the oven. so as to divide it (when desired) into two partsand form a flue through the center; (in Fig. 1 this flue is removed itsposition is indicated by red lines), the flue is shown detached in Fig.4:; it consists of two horizontal plates joined at each side by verticalones which keep them at proper distance apart for the flue. The courseof the draft is denoted by red arrows. The holes in the front and backoven plates. may be stopped by sliding dampers or in any otherconvenient way, and they may be made to have openings sufficient to"ventilate the oven by the air admitted at the doors, or an aperture maybe made through the front oven plate from the air chamber between theoven and fire back and another aperture with a proper damper appliedcommunicating with the descending back flue for the purpose ofventilating the oven. An air chamber (T) is formed as above namedbetween the back of the fire chamber and the front oven plate above thedivision flue (z') of the oven; the air is admitted to this air chamberT through apertures (Z) in the side plates of the stove, (but in someinstances through the front, and in others through the bottom plates),and after being in some degree heated it passes up; through apertures(m) at top into the horizontal flue, and aids in the combustion of thegas, &c., that passes off from the burning fuel while it prevents theloss of heat at that point and keeps the front oven plate at a propertemperaturea proper register being fitted to regulate the amount of airto pass through. (a, n,) are air chambers which surround the back andbottom of the stove outside the fluesthey communicate with each otherand with side flues (n, n) formed on the sides or edges of the fluesabove and below the oven doors; the upper air flues (11,) open under thegrate of the fire chamber where it discharges the heated air from theother flues, and by this means the combustion is kept up, and an economyof fuel is effected while there is no heat wasted by radiation from theoutside of the stove. The summer arrangement (0) is attached to thefront of the tove so that it can readily be removed; the fire chamber isfurnished with a grate (p) this chamber receives the draft of airthrough air opening (g) at one end under the grate; at the opposite endin the corner rangement a diving flue is formed for the summerarrangement the upper part or cover of which is raised so as to containthe heated air and products of combustion till they are consumed andtheir heat evolved before they escape.

It will be obvious that any portion of the heat-ingvchamber (n, n, n, n)may be connected with the ash pit by a direct flue to the same, and thatmany changes in the general-arrangement of the parts of my stove may bemade while my improvements are retained; the flues (n, n, n, a) may beon the outside of the stove and movable at pleasure. The form ofdivision plate represented in Fig. 3 may be provided. The apertures maybe covered that leads to the fire and the air let in to the center fireat each end, forming a hollow tube, with a slot to let the air into thechamber of combustion as shown at .Fig; 5.

What I claim as my invention and desire to secure by Letters Patentis 1. The movable flue (11) for dividing the oven into two parts, asabove specified.

2. I also claim forming an aperture in the division plate (a) betweenthe front boilers to protect it from the intense heat of the fire and tosupply air for combustion as described.

JAME$ MACGREGOR, JR.

Witnesses:

ALEXR. PORTER BRoWNE, J. J. GREENOUGH.

